Breast-drill.



Patented June 6, 1911.

A. FOX.

BREAST DRILL.

APPLICATION FILED 131:0. 1e, 1009.

Illummm alinement with each other.

unirsi) STATES rarnnr OFFICE- ALPHEUS FOX, OF CHICAGO, ILLINOIS.

BREAST-DRILL.

To all 'whom it may concern:

Be it known that I, ALrHnUs FoX, a citizen of the United States, and aresident of the city of Chicago, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements in Breast-Drills; and I do hereby declare that the following is a full, clear, andexact description of the same, reference being had to the accompanyingdrawings, and to the numbers of reference marked thereon, which form apart of this specification.

My invention relates to breast drills, and has for its object to providean improved mechanism therefor for feeding the drill to and from thework, said mechanism operating in conjunction with an adjustable worktable for supporting the material to be operated upon. This Obj ect Iaccomplish in the manner and by the means hereinafter described andclaimed, reference being had to the accompanying drawing, in whichFigure 1 is a view in side elevation partly in section. Fig. 2 is afragmentary section on line 2 2 of Fig. 1, with parts omitted. Fig. 3 isa section on line 3-3 of Fig. 1. Fig. 4 is a fragmentary detailillustrating a construction whereby the feeding device embodied in myinvention may be attached to any breast drill. Fig. 5 is a section online 5-5 of Fig. 4. Fig. 6 is a section on line 6-6 of Fig. 4, withparts omitted.

As shown in the drawings: 1, indicates the shank of a breast drill ofthe usual or any suitable construction. 2, indicates the breast piecesecured thereon, and 3, the rotatable chuck, the rotatable head of whichprovided with a bevel pinion 4, as shown in Fig. 1, and meshingtherewith is a bevel gear 5, adjustably secured on the shank 1, by meansof a bolt 6, extending therethrough and adjustably engaging the shank inanysuitable manner as, for instance, by engaging in either of two boltreceiving holes in said shank disposed in vertical Said bolt alsosecures upon said bevel gear wheel a crank 7, whereby said gear wheeland thereby the pinion and chuck may be rotated.

As shown, complemental pinions 8 and 9, are provided, the one integralwith the pinion 4, and the other integral with the gear and which are'adapted to mesh together to afford a slower drive when it is desired. Toafford this adjustment the screw bolt 6, is'removed from the upper ofthe two bolt l Serial No. 533,497.

receiving holes in the shank 1, and the pinions 8 and 9 meshed, in whichadjustment said screw bolt 6 will be in position to enter the lower ofthe bolt receiving holes in said shank 1. A drill bit 10, of any kind issecured in the chuck for use in its characteristie manner.

Cn the rear side of the shank or that side opposite from the bevel gear5 and bevel pinion 9, are bosses 11 and 12, as shown rectangular incross section and adapted to fit in a longitudinal slot 13, in the rackbar 14. Said bar is of a length to extend downwardly to near or belowthe lower end of the chuck, and as shown, is provided on its outer sidenear its lower end with upper and lower set screws 15 and 16, which areadapted to project through slotted holesin the shank 17, integral withthe table 18, which projects horizont-ally beneath the point of thedrill. Said longitudinal slot in the rack bar 14, is provided with rackteeth on one side thereof adapted to mesh with a pinion 19, which fitsinto the slot in said rack bar and is rigidly secured on a shaft 20,journaled in` the shank' 1 and which is provided with a hand wheel 21,so that the drill may be elevated from or forced downwardly toward thetable 1S, positioned beneath the same. Said rack bar -is slidablyengaged on the studs or projections 11 and 12, inany suitable manner.-As shown, a relatively large washer 22, is appliedy on each of saidprojections and overlaps the rack bar and a set screw 23, extendstherethrough and engages the same rmly in place yet permits the rack barfree movement when actuated by its pinion, either in drawing the drilldownwardly to the table or in elevating the drill therefrom.

It frequently happens that breast drills are not so constructed as toafl'ord a sufficient body of metal centrally of` the shank and above thechuck to permit of easy adjustment of the feed device embodying myinvention. In applying the device to such a breast drill, the rack barand table only are used, as shown in Figs. 4 to 6 inclusive. Connectionwith such a breast drill is readily accomplished by providing a clampingband 24, which engages the upper end of the chuck beneath the bevelgears, and as shown, a set screw 25, is provided in said clamp to bearagainst said chuck to hold the clamp firmly in place. A rectangular studor projection 26, similar to the stud 11, or 12,

Patented-June, 1911.

before described, is provided on said clamp and adapted to project intothe rack bar 14, as before described, and is likewise provided with awasher 22 and cap screw 23, which engage outside the rack bar and holdthe same firmly in place although permitting vertical adjustment. In asimilar manner a clamp 27, engages the upper part'of the shank 1, of thebreast drill, as shown in Figs. 4 and 6, said clamp being made in twoparts and conveniently articulated together by means of pins 28, andalso provided with a rectangular stud 26, washer 22 and cap screw 23, tohold the rack bar in operative relation.

The operation is as follows: Should it be desired to use the breastdrill for bor 4drill toward or from each other.

ing in wood or in any situation where the feed and centering device maynot be required, the same can be immediately removed from the device bysimply removing the cap screws holding the rack bar in place. Thispermits the same together with the shaft 20, and pinion 19, to beremoved intact to be again returned to place whenever required, or,should it not be desired to disassemble the structure, the table orfootpiece only may be removed by loosenino the screws 15 and 16, andslid-ing the shank 17, on the lower end of the rack bar sufficiently topermit disengagement therefrom. The same is true also of theconstruction shown in Figs. 4 to 6 inclusive which clearly indicatesthat the special feed mechanism embodying my invention may be quicklydetached or applied, if desired, lto breast drills of any construction.When using the device as a feed mechanism it is only necessary to placethe device to be drilled upon the table or foot piece 18, which .issufficiently broad to support the drill in an upright position. If thedrill then is operated any desired degree of pressure may be securedupon the material operated upon by rotating the hand wheel 21, slowly,thereby rotating the pinion in the slot of the rack `bar and thus movingthe rack bar and supporting table and the When it is desired to retractthe drill it may be very quickly accomplished by means of the said handWheel, pinion and rack. Practically any desired pressure may be securedupon the work and the pressure may be very readily graduated by means ofthe hand wheel and pinion. Inasmuch as the foot-piece is of suiHcientsize to ordinarily support the device in an upright position, it followsthat the device serves every purpose of a bench or post drill.Furthermore, owing to the construction, should it be necessary tooperate the tool in positions occupying slight space, the table orfoot-piece 18, may be hooked beneath or on one side of the piece to bedrilled, as, for instance, a part of a machine frame of any kind, andthe drill steadied in position by holding the same with one hand applied'to the hand wheel 21, while the crank is operatedto'v rotate the chuck.

Of course, owing to the jointed connection between the rack bar andfoot-piece, several different foot-pieces may be employed, some of whichmay be a mere hook to engage beneath the device to be drilled should thespace therebeneath be exceedingly small.

Of course, numerous details of the construction may be varied. Itherefore do not purpose limiting myself otherwise than necessitated bythe appended claim.

I claim as my invention:

A device of the class described, embodying a breast drill, alongitudinally slotted internally racked bar slidably engaged o-n saiddrill and parallel with the aXis thereof, said drill being supported andguided in the slot in said bar, a pinion rotatably engaged on the shankof the drill and in mesh with said rack in the slot in said bar, meansfor rotating saidpinion, and a table connected with the lower end ofsaid lrack bar and projecting beneath the drill.

I n testimony whereof I have hereunto subscribed my name in the presenceof -tWo subscribing witnesses.

p ALPHEUS FOX.

Witnesses Copies of this ypatent may be obtained for five cents each, byaddressing lthe Washington, D. C."

Commissioner of Patents,

